To put the OP's experience into perspective into probabilistic perspective. 180 energy = 18 sims (lowest cost node for cuff salvage is 10 energy per attempt). Item has a 1/6 drop rate. Obtained one.
So through using the binomial distribution, setting p = 1/6, n = 18, x = 1, we can see that by using 180 energy, you should expect 1 piece of cuff salvage roughly 13.5% of the time.
You would see 2 salvage ~23% of the time, 3 salvage ~24.5% of the time, 4 salvage ~18.4% of the time, 5 salvage ~10.3% of the time, and so on with decreasing probabilities from there with higher numbers of salvage obtained.